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Merlin regulates signaling events at the nexus of development and cancer
Mateus Mota1, Lalita A Shevde2,3
1Department of Pathology, University of Alabama at Birmingham, WTI 320D, 1824 6th Avenue South, Birmingham, AL, 35233, USA.
Background:
In this review, we describe how the cytoskeletal protein Merlin, encoded by the Neurofibromin 2 (NF2) gene, orchestrates developmental signaling to ensure normal ontogeny, and we discuss how Merlin deficiency leads to aberrant activation of developmental pathways that enable tumor development and malignant progression.
Main Body:
Parallels between embryonic development and cancer have underscored the activation of developmental signaling pathways. Hippo, WNT/β-catenin, TGF-β, receptor tyrosine kinase (RTK), Notch, and Hedgehog pathways are key players in normal developmental biology. Unrestrained activity or loss of activity of these pathways causes adverse effects in developing tissues manifesting as developmental syndromes. Interestingly, these detrimental events also impact differentiated and functional tissues. By promoting cell proliferation, migration, and stem-cell like phenotypes, deregulated activity of these pathways promotes carcinogenesis and cancer progression. The NF2 gene product, Merlin, is a tumor suppressor classically known for its ability to induce contact-dependent growth inhibition. Merlin plays a role in different stages of an organism development, ranging from embryonic to mature states. While homozygous deletion of Nf2 in murine embryos causes embryonic lethality, Merlin loss in adult tissue is implicated in Neurofibromatosis type 2 disorder and cancer. These manifestations, cumulatively, are reminiscent of dysregulated developmental signaling.
Conclusion:
Understanding the molecular and cellular repercussions of Merlin loss provides fundamental insights into the etiology of developmental disorders and cancer and has the potential, in the long term, to identify new therapeutic strategies. Video Abstract.
Insights
The cytoskeletal protein Merlin, encoded by the Neurofibromin 2 (NF2) gene, is crucial for normal development. Merlin deficiency disrupts developmental pathways, leading to tumor development and cancer progression.
Area of Science:
- Cell Biology
- Developmental Biology
- Oncology
Background:
- The cytoskeletal protein Merlin, encoded by the Neurofibromin 2 (NF2) gene, plays a vital role in orchestrating developmental signaling for normal ontogeny.
- Merlin deficiency is linked to aberrant activation of key developmental pathways, including Hippo, WNT/β-catenin, TGF-β, RTK, Notch, and Hedgehog.
- Dysregulated activity of these pathways, often due to Merlin loss, promotes carcinogenesis and cancer progression by enhancing cell proliferation, migration, and stem-cell-like phenotypes.
Purpose of the Study:
- To review the role of the cytoskeletal protein Merlin in normal development and cancer.
- To discuss how Merlin deficiency leads to the aberrant activation of developmental pathways.
- To explore the implications of Merlin loss in tumor development and malignant progression.
Main Methods:
- Review of existing literature on Merlin function, developmental biology, and cancer.
- Analysis of the molecular and cellular repercussions of Merlin loss.
- Discussion of the parallels between embryonic development and cancer signaling pathways.
Main Results:
- Merlin is essential for normal ontogeny, with homozygous deletion of Nf2 causing embryonic lethality in mice.
- Merlin loss in adult tissues is implicated in Neurofibromatosis type 2 and various cancers.
- Aberrant activation of developmental pathways due to Merlin deficiency drives tumor development and malignant progression.
Conclusions:
- Understanding Merlin's role in development and cancer provides fundamental insights into disease etiology.
- Merlin deficiency disrupts developmental signaling, contributing to tumor formation and progression.
- Further research into Merlin's molecular and cellular functions may reveal new therapeutic strategies for developmental disorders and cancer.
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